PHP mysql_num_rows WHERE this equals this

Question

Is it possible to do something like the WHERE clause in a mysql_num_rows statement in PHP? For example, say I have the column "number" in my database. I want to use mysql_num_rows($number) to display how many rows have the number 1. I know the other ways to do this, but it would be much much easier for what I'm doing to be able to use mysql_num_rows with a WHERE clause.

Answer 1

SELECT COUNT(*) cnt FROM tablename WHERE rowname = 1

使用此查询，您不需要 mysql_num_rows ，这在不需要数据本身但需要行数的情况下会增加开销 。